Restoring the sting to metric preheating

BA Bassett, C Gordon, R Maartens, DI Kaiser

Research output: Contribution to journalArticlepeer-review


The relative growth of field and metric perturbations during preheating is sensitive to initial conditions set in the preceding inflationary phase. Recent work suggests this may protect super-Hubble metric perturbations from resonant amplification during preheating. We show that this possibility is fragile and sensitive to the specific form of the interactions between the inflaton and other fields. The suppression is naturally absent in two classes of preheating in which either: (1) the vacua of the noninflaton fields during inflation are deformed away from the origin; or (2) the effective masses of noninflaton fields during inflation are small but during preheating are large. Unlike the simple toy model of a g2Φ2χ2 coupling, most realistic particle physics models contain these other features. Moreover, they generically lead to both adiabatic and isocurvature modes and non-Gaussian scars on super-Hubble scales. Large-scale coherent magnetic fields may also appear naturally.
Original languageEnglish
Article number061302
Pages (from-to)061302
JournalPhysical Review D
Issue number6
Early online date22 Feb 2000
Publication statusPublished - 15 Mar 2000


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